Dell inspiron 17r se 7720 (650m)
I use Arch Linux
When I use gpu offloading (optimus) Xorg freezes after 30 seconds - 5 minutes and then I see this:
BUG unable to handle kernel NULL pointer dereference at....
On 319.17 system also freezes randomly but continues to work after switching to tty and back
On ubuntu 13.04 kernel 3.9.1 (custom without patches ) an Xorg (ppa:xorg-edgers) system works pretty well with 319.17